HPS and MH or just HPS'

About to install a dual bulb reflector and was wondering if you guys had any thoughts on using a MH bulb along with a HPS or should I just put 2 HPS's in there. I am a week into floweing with one 600w HPS. The other bulb will be 600w as well.

Also is it just me or does the hps bulb burn hotter then an equivalent MH bulb

Thanks

if flowering then def use 2 hps, vegging then maybe 1 of each if not 2 MH bulbs

How about using one of these along with a normal hps bulb

http://www.pchydro.com/grow-lights-lamps-bulbs-c-5_18/600w-agrosun-red-p-1942

use the two HPS bulbs, but get some MH conversion bulbs if that tickles your fancy... oh and classically, MH are hotter and have less lumens than comparable HPS lamps.